基于边界体素的Shear-warp Splatting体绘制算法  

Boundary Voxel-based Shear-warp Splatting Volume Rendering Algorithm

作　　者：彭延军[1] 石教英[1] 

机构地区：[1]浙江大学CAD&CG国家重点实验室,杭州310027

出　　处：《计算机工程与应用》2002年第13期13-16,共4页Computer Engineering and Applications

基　　金：国家自然科学基金重点项目(编号:60033010)

摘　　要：将错切空间中体素投影到中间图像平面的过程中,要影响到该体素对应象素周围的其它象素,该文重新设计了计算对应象素权值的简单方法,使结果图像的质量与最近邻点投影方法相比有较大提高。为了加速体绘制,方法是先找出切片数据集中包围同种物质的边界体素,由于被这一边界所包围的体素有相同的属性,可以一次投影这一体素块,从而提高了绘制速度。文章还设计了低、中、高三种不同分辨率的投影模式,可根据需要选择一种。在数据结构上,使用了索引和游程编码方式,缩减了存储容量并加快了查找边界体素的速度。Based on the fact that voxels in shear sp ace splashed to the intermediate image will contribute to their neighboring pixe ls,this paper redesigns simple weighting function of pixel,consecutively the i mage quality is improved comparing with that the nearest point projection metho d produces.In order to accelerate the speed of volume rendering,the method is to find out the boundary voxels that surround the same kind of medium in slic e data firstly.Because of uniform attribute of voxels inside of the boundary,t hey can be projected to intermediate image plane all together once.The paper pr ovides one of three resolution projection modes(low,intermediate and high)to improve speed further.The run-length coding and index data structure are used to reduce memory capacity and to increase the speed of finding out the boundary voxels.

关 键 词：边界体素 SHEAR-WARP Sphlatting 体绘制算法 分辨率 图像质量 计算机 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]